Battlestations: Midway

Play the fourth Campaign mission where you're in a plane most of the time. There are exactly 10 ships here that you can take out with your plane.

In the last stage you have a Carrier. Simply launch 4 separate Torpedo Bombers and sink every ship you can see. They need to be separate because if you have a squad, they might get the final killing hit instead of you. Just keep switching from plane to plane as they use the bombs, and send each back to the Carrier. If you crash them too often, you may run out of planes before you're done. Sink the Battleship last because this will end the mission.

IMPORTANT: Once you have only the Battleship left, make sure to control the Carrier and just leave it idle for 5 minutes so that you're "using" it for the required 5 minutes. Then sink the Battleship and you're done!

NOTE: Boats do not count, only ships, so don't assume that you have it if you've sunk some boats but left the ships intact. This means PT Boats and Fishing Boats do not count. PT Boats have numbers in their name, and they are noticeably smaller, faster and weaker than ships.

You can also get this in Multiplayer, through legitimate skill or boosting, as long as the mission you play has enough ships in it.